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Because the suite of Affinity Publisher, Affinity Designer and Affinity Photo can all load and save each other's files , we are not adding functionality like this into APu that belong more naturally in another application (like APh).

You will see that there are 2 other currently disabled personas in Affinity Publisher

the Vector persona that will enable if you have (a suitable 1.7 or greater build of ) Affinity Designer installed [on the same Desktop PC]
and

the Photo persona that will enable if you have (a suitable 1.7 or greater build of ) Affinity Photo installed [on the same Desktop PC]

So you should be able to edit the tiff file within APu once there are compatible builds of Affinity Photo available to buy (or upgrade to if you own 1.6)